( Story told by Swami Vivekananda )
In America there was a great agnostic, a very noble man, a very good man, and a very fine speaker. He lectured on religion, which he said was of no use; why bother our heads about other worlds? He employed this simile; we have an orange here, and we want to squeeze all the juice out of it.
I met him once and said, “I agree with you entirely. I have some fruit, and I too want to squeeze out the juice. Our difference lies in the choice of the fruit. You want an orange, and I prefer a mango. You think it is enough to live here and eat and drink and have a little scientific knowledge; but you have no right to say that that will suit all tastes. Such a conception is nothing to me. If I had only to learn how an apple falls to the ground, or how an electric current shakes my nerves, I would commit suicide. I want to understand the heart of things, the very kernel itself. Your study is the manifestation of life, mine is the life itself. My philosophy says you must know that and drive out from your mind all thoughts of heaven and hell and all other superstitions, even though they exist in the same sense that this world exists. I must know the heart of this life, its very essence, what it is, not only how it works and what are its manifestations. I want the why of everything, I leave the how to children. As one of your countrymen said, ‘While I am smoking a cigarette, if I were to write a book, it would be the science of the cigarette.’
It is good and great to be scientific, God bless them in their search; but when a man says that is all, he is talking foolishly, not caring to know the raison d’être of life, never studying existence itself. I may argue that all your knowledge is nonsense, without a basis. You are studying the manifestations of life, and when I ask you what life is, you say you do not know. You are welcome to your study, but leave me to mine.”
Source : The Complete Works of Swami Vivekananda/Volume 2/Jnana-Yoga/Unity in Diversity